الفهرس | Only 14 pages are availabe for public view |
Abstract This thesis was conducted to evaluate the shrinkage behavior of self-compacting concrete (SCC) mixtures. As cement content of self compacting concrete is higher compared to normal concrete, final shrinkage is higher and the resistance against the evaluation of induced cracks is lower. The main parameters taken into consideration were cement type, fiber type, volume fraction of fibers and weather conditions (air laboratory, open atmosphere and humidity ratio). Three types of fibers are used, hooked end steel fibers, cramped steel fibers and polypropylene fibers. Time dependent behavior of SCC was investigated in terms of its mechanical properties (compressive strength, splitting tensile strength, flexural strength and modules of elasticity) and time– dependent deformation. Time-dependent deformations are expressed in terms of plastic shrinkage and creep. Fresh properties of SCC are investigated (segregation resistance, and plastic shrinkage). The mixes were cast with ordinary Portland cement gave flow ability more than the mixes with lime stone cement by ٤٪ and the use of fibers reduced the drying shrinkage compared to that of the control mix. Also the drying shrinkage decreased as the volume fraction increases. These results were noticed in the laboratory and open atmosphere. |